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Versión actual por: oldturkey03 ,

Texto:

@blangstile if you identified your computer properly the diagnostic LED's should be located right there

[image|1060542]

LED #1

• Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will remain ON whenever the iMac is connected
due to a working AC power source. The LED will remain on even when the computer has been shut down or putnew inforamtion I've made adjustment to sleep.

The LED will turn off only if
the AC power sourceanswer. Looks like your compuiter is disconnected or the power supply is faulty.

LED #2

• Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.

LED #3

• Indicates that the computer and the LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated.

Front LED

• Indicates that the computer has power but no video signal (e.g., the computer is starting up or the display has entered Sleep mode, turning off the video signal). This LED will pulse when the entire system has entered Energy Saver mode.
an early 2006. Those did not yet have diagnostic LED's
@blangstile if you identified your computer properly the diagnostic LED's should be located right there

[image|1060542]

LED #1

• Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will remain ON whenever the iMac is connected
due to a working AC power source. The LED will remain on even when the computer has been shut down or putnew inforamtion I've made adjustment to sleep.

The LED will turn off only if
the AC power sourceanswer. Looks like your compuiter is disconnected or the power supply is faulty.

LED #2

• Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.

LED #3

• Indicates that the computer and the LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated.

Front LED

• Indicates that the computer has power but no video signal (e.g., the computer is starting up or the display has entered Sleep mode, turning off the video signal). This LED will pulse when the entire system has entered Energy Saver mode.
an early 2006. Those did not yet have diagnostic LED's
No Video, No Boot Chime, White LED ON (Symptom 1)
The iMac (Early 2006) will turn on (indicated by the front LED ON), but there is NO boot chime and No Video on the display. The faint sound of the fans, hard drive, and optical drive may also be heard.
1. Reset

Reset
the SMC (Formerly SMU).
-- Turn off

From
the computer by choosingApple menu, choose Shut Down from the Apple menu, or by holding(or if the computer is not responding, hold
the
power button until the computerit turns off.
-- Unplug
off).
Unplug
all cables from the computer, including the power cord.
-- Wait
cord and any display cables.
Wait at least
15 seconds.
-- Plug in

Plug
the power cord while simultaneously pressing and holdingback in, making sure the power button onis not being pressed at the back of
same time. Then reconnect your keyboard and mouse to
the computer.
-- Let go of the power button.
-- Press

Press
the power button once moreon the back of the computer to start up your iMaccomputer.
The iMac (Early 2006) will turn on (indicated by the front LED ON), but there is NO boot chime and No Video on the display. The faint sound of the fans, hard drive, and optical drive may also be heard.
1. Reset

Reset
the SMC (Formerly SMU).
-- Turn off

From
the computer by choosingApple menu, choose Shut Down from the Apple menu, or by holding(or if the computer is not responding, hold
the
power button until the computerit turns off.
-- Unplug
off).
Unplug
all cables from the computer, including the power cord.
-- Wait
cord and any display cables.
Wait at least
15 seconds.
-- Plug in

Plug
the power cord while simultaneously pressing and holdingback in, making sure the power button onis not being pressed at the back of
same time. Then reconnect your keyboard and mouse to
the computer.
-- Let go of the power button.
-- Press

Press
the power button once moreon the back of the computer to start up your iMaccomputer.
Does the computer display video after successfully resetting the SMC?
Yes: Problem solved.
No: Continue to next step.
2. Verify that only supported SDRAM memory has been installed and that it has been installed correctly. Unsupported and/or defective memory can prevent the iMac (Early 2006) from booting. It
It
may be necessary to install known good memory for testing purposes and replace any unsupported or defective SO-DIMM’s identified during this process.
2. Verify that only supported SDRAM memory has been installed and that it has been installed correctly. Unsupported and/or defective memory can prevent the iMac (Early 2006) from booting. It
It
may be necessary to install known good memory for testing purposes and replace any unsupported or defective SO-DIMM’s identified during this process.
Does the computer display video after verifying and/or replacing the memory with known good memory?
Yes: Problem solved. Verify full system functionality before return the system to the customer.
No: Replace the logic board.
 
Don't replace the logic board yet :-) this is the sequence to check according to Apple :-)

Estatus:

open

Editado por: oldturkey03 ,

Texto:

@blangstile if you identified your computer properly the diagnostic LED's should be located right there
 
[image|1060542]
 
LED #1
 
• Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. The LED will remain on even when the computer has been shut down or put to sleep.
 
The LED will turn off only if the AC power source is disconnected or the power supply is faulty.
 
LED #2
 
• Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
 
LED #3
 
• Indicates that the computer and the LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated.
 
Front LED
 
• Indicates that the computer has power but no video signal (e.g., the computer is starting up or the display has entered Sleep mode, turning off the video signal). This LED will pulse when the entire system has entered Energy Saver mode.
 
No Video, No Boot Chime, White LED ON (Symptom 1)
The iMac will turn on (indicated by the front LED ON), but there is NO boot chime and No Video on the display. The faint sound of the fans, hard drive, and optical drive may also be heard.
1. Reset the SMC (Formerly SMU).
-- Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
-- Unplug all cables from the computer, including the power cord.
-- Wait 15 seconds.
-- Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
-- Let go of the power button.
-- Press the power button once more to start up your iMac.
Does the computer display video after successfully resetting the SMC?
Yes: Problem solved.
No: Continue to next step.
2. Verify that only supported SDRAM memory has been installed and that it has been installed correctly. Unsupported and/or defective memory can prevent the iMac from booting. It may be necessary to install known good memory for testing purposes and replace any unsupported or defective SO-DIMM’s identified during this process.
Does the computer display video after verifying and/or replacing the memory with known good memory?
Yes: Problem solved. Verify full system functionality before return the system to the customer.
No: Replace the logic board.
 
Don't replace the logic board yet :-) this is the sequence to check according to Apple :-)

Estatus:

open

Editado por: oldturkey03 ,

Texto:

@blangstile if you identified your computer properly the diagnostic LED's should be located right there
 
[image|1060542]
LED #1
• Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. The LED will remain on even when the computer has been shut down or put to sleep.
The LED will turn off only if the AC power source is disconnected or the power supply is faulty.
LED #2
• Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
LED #3
• Indicates that the computer and the LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated.
Front LED
• Indicates that the computer has power but no video signal (e.g., the computer is starting up or the display has entered Sleep mode, turning off the video signal). This LED will pulse when the entire system has entered Energy Saver mode.

Estatus:

open

Aporte original por: oldturkey03 ,

Texto:

@blangstile if you identified your computer properly the diagnostic LED's should be located right there

[image|1060542]

Estatus:

open